apache-arrow/io/file.d.ts

Apache Arrow columnar in-memory format

import { FileHandle } from './interfaces.js';
import { ByteStream, AsyncByteStream } from './stream.js';
import { ArrayBufferViewInput } from '../util/buffer.js';
/** @ignore */
export declare class RandomAccessFile extends ByteStream {
    size: number;
    position: number;
    protected buffer: Uint8Array | null;
    constructor(buffer: ArrayBufferViewInput, byteLength?: number);
    readInt32(position: number): number;
    seek(position: number): boolean;
    read(nBytes?: number | null): Uint8Array | null;
    readAt(position: number, nBytes: number): Uint8Array;
    close(): void;
    throw(value?: any): {
        done: boolean;
        value: any;
    };
    return(value?: any): {
        done: boolean;
        value: any;
    };
}
/** @ignore */
export declare class AsyncRandomAccessFile extends AsyncByteStream {
    size: number;
    position: number;
    _pending?: Promise<void>;
    protected _handle: FileHandle | null;
    constructor(file: FileHandle, byteLength?: number);
    readInt32(position: number): Promise<number>;
    seek(position: number): Promise<boolean>;
    read(nBytes?: number | null): Promise<Uint8Array | null>;
    readAt(position: number, nBytes: number): Promise<Uint8Array>;
    close(): Promise<void>;
    throw(value?: any): Promise<{
        done: boolean;
        value: any;
    }>;
    return(value?: any): Promise<{
        done: boolean;
        value: any;
    }>;
}